A method for acquiring dynamic information of a living body comprises steps: arranging a plurality of temperature measurement points on a surface, and pointwise encoding positions of the plurality of temperature measurement points decoding to receive the positions of the temperature measurement points and temperatures detected by the temperature measurement points in different time intervals with a same given length obtaining an ambient temperature comparing the temperatures of the temperature measurement points with the ambient temperature respectively to determine relative temperatures of the temperature measurement points and comparing the relative temperature in the current time interval with the relative temperature in the last time interval for each of the temperature measurement points respectively to determine the temperature variations of the plurality of temperature measurement points in each time interval and thus acquire dynamic information of the living body on the surface.
